package main

import (
	"bytes"
	"encoding/json"
	"net/http"
	"strconv"
	"testing"
	"time"
)

func clearTagClassTable() {
	a.DB.Exec("DELETE FROM tagClasses")
	a.DB.Exec("ALTER TABLE tagClasses AUTO_INCREMENT = 1")
}

func TestEmptyTagClassTable(t *testing.T) {
	clearTagClassTable()

	req, _ := http.NewRequest("GET", "/api/v1/tagClasses", nil)
	response := executeRequest(req)

	checkResponseCode(t, http.StatusOK, response.Code)

	if body := response.Body.String(); body != "[]" {
		t.Errorf("Expected an empty array. Got %s", body)
	}
}

func TestGetNonExistentTagClass(t *testing.T) {
	clearTagClassTable()

	req, _ := http.NewRequest("GET", "/api/v1/tagClass/11", nil)
	response := executeRequest(req)

	checkResponseCode(t, http.StatusNotFound, response.Code)

	var m map[string]string
	json.Unmarshal(response.Body.Bytes(), &m)
	if m["error"] != "TagClass not found" {
		t.Errorf("Expected the 'error' key of the response to be set to 'TagClass not found'. Got '%s'", m["error"])
	}
}

func TestCreateTagClass(t *testing.T) {
	clearTagClassTable()

	payload := []byte(`{"classType":"Normal","description":"Historical Data"}`)

	req, _ := http.NewRequest("POST", "/api/v1/tagClass", bytes.NewBuffer(payload))
	response := executeRequest(req)

	checkResponseCode(t, http.StatusCreated, response.Code)

	var m map[string]interface{}
	json.Unmarshal(response.Body.Bytes(), &m)

	if m["classType"] != "Normal" {
		t.Errorf("Expected tagClass classType to be 'Normal'. Got '%v'", m["classType"])
	}

	if m["description"] != "Historical Data" {
		t.Errorf("Expected tagClass description to be 'Historical Data'. Got '%v'", m["description"])
	}
}

func TestGetTagClass(t *testing.T) {
	clearTagClassTable()
	addTagClasses(1)

	req, _ := http.NewRequest("GET", "/api/v1/tagClass/1", nil)
	response := executeRequest(req)

	checkResponseCode(t, http.StatusOK, response.Code)
}

func addTagClasses(count int) {
	if count < 1 {
		count = 1
	}
	insStmt, insErr := a.DB.Prepare("INSERT INTO tagClasses(classType, description, createdAt, updatedAt) VALUES(?, ?, ?, ?)")
	if insErr != nil {
		panic(insErr.Error()) // proper error handling instead of panic in your app
	}
	defer insStmt.Close() // Close the statement when we leave main() / the program terminates

	for i := 0; i < count; i++ {
		insStmt.Exec("TESTTYPE"+strconv.Itoa(i), "TESTDESCRIPTION"+strconv.Itoa(i), time.Now(), time.Now())
	}
}

func TestUpdateTagClass(t *testing.T) {
	clearTagClassTable()
	addTagClasses(1)

	req, _ := http.NewRequest("GET", "/api/v1/tagClass/1", nil)
	response := executeRequest(req)
	var originalTagClass map[string]interface{}
	json.Unmarshal(response.Body.Bytes(), &originalTagClass)

	payload := []byte(`{"classType":"handshake","description":"PLC Handshake"}`)

	req, _ = http.NewRequest("PUT", "/api/v1/tagClass/1", bytes.NewBuffer(payload))
	response = executeRequest(req)
	checkResponseCode(t, http.StatusOK, response.Code)

	var m map[string]interface{}
	json.Unmarshal(response.Body.Bytes(), &m)

	if m["id"] != originalTagClass["id"] {
		t.Errorf("Expected the id to remain the same (%v). Got %v", originalTagClass["id"], m["id"])
	}

	if m["classType"] == originalTagClass["tagClass"] {
		t.Errorf("Expected the classType to change from '%v' to '%v'. Got '%v'", originalTagClass["classType"], m["classType"], m["classType"])
	}

	if m["description"] == originalTagClass["description"] {
		t.Errorf("Expected the description to change from '%v' to '%v'. Got '%v'", originalTagClass["description"], m["description"], m["description"])
	}
}

func TestDeleteTagClass(t *testing.T) {
	clearTagClassTable()
	addTagClasses(1)

	req, _ := http.NewRequest("GET", "/api/v1/tagClass/1", nil)
	response := executeRequest(req)
	checkResponseCode(t, http.StatusOK, response.Code)

	req, _ = http.NewRequest("DELETE", "/api/v1/tagClass/1", nil)
	response = executeRequest(req)

	checkResponseCode(t, http.StatusOK, response.Code)

	req, _ = http.NewRequest("GET", "/api/v1/tagClass/1", nil)
	response = executeRequest(req)
	checkResponseCode(t, http.StatusNotFound, response.Code)
}